They (Galaxy) advertise that they can run both, and I believe it's the DE bulbs that are more "fickle" , but I have cheap 1000 watt digital ballasts that seem to run DE bulbs just fine.
I'm in the ballast market myself right now and looking for something that will run both DE and singles, MH and HPS, with 600, 750, 1000, and boost settings, and preferably an internal fan. There really aren't a lot of choices!! And I have had bad luck buying expensive ones in the past.